This is a detailed guide on how to lvl up in GoD. I know that there is a few more guides out there but i've decided to post a more detailed guide for those who want super detail.
Here it goes:

-> Level 1-20Alternitive Way:If you have some adena and you want to save time you can always buy a few Fortune Pockets and use them to lvl up and SP Scrolls get enought SP for your skills.

Nothing much to say about this. You just need to do the quests. More detail on how to do this quests here.
All the quests start where the previous quest ended, so it should be easy to keep track of things.

With the completion of the first class transfer you will be awarded with some Proof of Courages. With them buy a D set needed by your class and some D grade jewels. You will be awarded with a top D grade sword in a few lvls. With the help of Black Marketeer of Mammon (you can find him at this spots) you can change this top D weapon in the one you want so in my opinion there's no need to buy a weapon with the proofs. Spend the rest of the Proofs in Soulshots or Blessed Spiritshots.

After this last two quests you should be in lvl 37. You need one more lvl to start the second transfer quest. If you didn't do any Kamalokas yet you can do a lvl 36 Kamaloka. If you did you can do a lvl 39 Kamaloka. Get a party and go do one. If you prefer, go to wasteland and complete your level there. When you get to lvl 38 its time to do the second transfer quest:

You will receive some Proof of Justice. Use it ONLY in Soulshots or Blessed Spiritshots. The reason why you should do it is in the next section.

Edit: Here's a brief explanation on Kamalokas work:
First: you can only do one Kamaloka for day for the levels X3 and X6 and another Kamaloka for day for the levels X9. That means if you do a kamaloka for level 26 you won't be able to do a level 43 or 46 in the same day. Beside this case there's the X9 Kamalokas (also called labs from labyrinth), in this case you can only do one for day. So if you did a Kamaloka level 29 you won't be able to do a level 39 in the same day.Kamaloka Guide

Second: The X9 Kamalokas have a few rooms with different monsters to kill. Most of the users just avoid them and go for the last boss. This is a mistake. The first room represent a lower pdef in the final boss, so if you defeat them the final Boss will have a lower pdef. The second room represent a lower mdef in the final boss and the third room represent a lower patk on the final boss. So depending on your party it may be advise to kill this monsters. (If this info is incorrect please correct me in a reply)Labyrinth Guide

-> Level 41-52Alternitive Way:If you have some adena and you want to save time you can always buy a few Fortune Pockets and use them to lvl up and SP Scrolls get enought SP for your skills.

Now is time to introduce you to the PATH TO AWAKENING.
Every time you get to a certain lvl you will be able to claim some bonus items in this website.
You will be able to claim this bonus at lvl 1, 20, 40, 45, 50, 55, 60, 65, 70, 75, 80 and 85. This means you wont need to buy any kind of equipment till S grade.
So, claim the lvl 1, 20 and 40 bonus and withdraw them from the Dimensional Merchant NPC.

After Lindvior most of the levelling quest system was changed. So, most of the quests were changed. In quote will be all the old levelling system.
Keep in mind that you can still levelling by killing RB.

This quest sends you to Ivory Tower. If you following the Lineage 2 patch notes form the official website you will notice that the quest description is wrong. It's not in Cruma, it's in Ivory Tower.
After the conclusion of this quest it's time to choose what to do next:

- Heine: Kamalokas (lvl 43, 46 and 49) They are a good source of XP/SP and you will be able to start a Cruma quest that will give you a nice reward too.
- Dion: Cruma Tower - There's a daily quest at the entrance. Very easy and with a good reward so if you can you should do it.

EDIT: My advise is to go to Heine and start Mutated Kaneus. Do lvl 46 Kamaloka first and then, in the next day (if you still can) do lvl 43 Kamaloka. (supposed to be fixed now) After you defeated the RB form Kamaloka a new npc will appear. (Rieyi) talk to her to start the quest:

This is a quest that most of ppl have a lot of problems to finish. Basically you need to gather a party and be the first to talk to the quest npc after he appears. The first leader to do so will get his party teleported to the top of Cruma to fight the RB Mertes. Kill it (don't let the minions heal him, kill them when they appear) and finish the quest at the entrance. I recommend doing it only once or twice, depending on how long you take to lvl. (In late lvls you will loose precious time doing this quest for a smaller XP % reward)
Don't forget to start the next quest when you enter Cruma:

This quest is a daily quest so do it as much as you can. (While farming in Cruma)

And till lvl 49 this is all the quests there is.
There are a few zones that you can take till lvl 49. Here's a few:
- Cruma Tower: It's probably the best place to XP in this range of levels. For the Cruma lvl 2 you will need to use the teleporters that are at the exit of the new elevator of Cruma. (Unfortunately this zone looks to be a bit bugged so some of the npcs could stop working or disappear to unknown places. The teleporters are one of this cases.)
- Ivory tower: Interesting zone but only good for the first lvls. I would recommend using Cruma.
- Cemitery: For ppl that need undead mobs to kill this is a perfect solution. Not as good as Cruma but healers could lvl up here faster.
- Enchanted Valley/Forrest of Mirrors: A good alternate place if you find Cruma too populated.

It's the same old quest, but with different levels.
Next, when you're at level 50 its time for the next quest:

Remember to this daily. If you gather all the tokens you will get a really cool ring.
The next quest is probably for those who have a good clan as backup, if not you only be able to do in late lvls. (60+)

I can't talk much about it (i making this without a clan, so i didn't finish this one yet) but if you finish this one you will get some extra tokens. I'm not sure how many but at least one you will get. That means you will be able to get the Ring in half of the time so it's an important one for those who can do it.
After all this, if you're not at level 55 go level in one of this places:
- Tower of Insolence: Let's face it, this is one of the most important locations in you're leveling. Could be tricky to level here alone so, if you can't do it solo try to get a party. level 1-3 is a good place for B grade.
- Forsaken Plains: A good place for solo hunting.

It's an easy quest, just hunt in Forsaken Plains till you finish the quest.

Next quest to do is at level 60 so choose your place and go level! Don't forget to do the daily quests (and the Kamalokas too, since they are the way to start at least one of this quests)
Before going to the level 60 quests let me remeber that if you got a really good party you can try to do Zaken day light instance. (Never tried...)

So, getting to level 60 will get you a few quests to do: Edit: There's been some reports that the start level of this quests was changed from 60 to 61.

-> Level 62-75Alternitive Way:If you have some adena and you want to save time you can always buy a few Fortune Pockets and use them to lvl up and SP Scrolls get enought SP for your skills. If you using Stage 3 Fortune Pockets you should be able to reach 65 with just a few of them. Beyond that the number need increases as you level.

And you can always try some old quests, but keep in mind that some are not working anymore. (Like Hidden Truth chain quests)

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Till level 64 you should be doing the quests i talked in the previous posts. They will give you adena and some XP so keep doing it. The quests from the Kamaloka npc give a good reward so start them if you need to.
At level 62 you have a new quest to do:

Till level 65 that's it when it comes to quests. So till level 65 you should try the next zones to level:
- Valley of Saints: Good and easy place to XP.
- Blazing Swamp: An alternative to the other places.
- Tower of Insolence: Better suited if you have a party with you. Level 6-9 are good places for you.
- Swamp of Screams: Easy kills so good place for some to XP.

Till level 75 only the dailys are worth doing. So it's time to grind hard.
There are a few zones that you can use:
- ToI Higher levels (for party groups)
- Crypt of Disgrace (for some classes you can solo them)
- deep Wall of Argos (If this place isn't completely full like it's been)
- Pavels Ruins (For AoE capable classes)

And a few more that you can explore. You will find that some other areas give less XP but the fact they are "players free" may be something to consider.

Quick note: In the new daily quests you have an option to continue farming more items to total of 900 items in most of the quests. Keep in mind that you get more XP if you get more items in a sort of exponential matter and not in a linear matter. That means if you get 200 items you will be getting more then 2x the XP you get form 100 items. I would advise you to get always the maximum number of items. So if you didnt finish in the day consider finish that quest in the next day to get the maximum XP possible. (believe m, it pays off)

After the quest is completed there's a lot to do. First thing to do is claim the last of the rewards from the path of awakening system. (Free S grade... weeee)

There's a few quests added to this levels.
Let's start with the new 76-80 content for warriors (one time quests):

Note: Think you can do all the dailys. (They shouldn't be class specific)

That's it for all the new content. Feel free to try any other quest or tip i included in the older post:

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Next you can do the sub quest or continue leveling.
I will let the subclass quest for later and focus on the leveling first. (EDIT: It is now a lvl 85+ quest, check the other section (Level 85+) for more information)

As you may already heard there is a super cool quest that gives you tones of XP (EDIT: Isn't as good now as it used to be). You can use that quest at level 77 so if you still didn't get there is a few places you can use to XP:
- Forge of Gods: If you get an AOE party of 7 ppl working good you will lvl really fast here. 76 to 79 is easy to get here. (Almost as fast as the PI quest)
- Tower of Insolence: High levels are a great way to XP too.
- Shrine of Loyalty/Wall of Argos: If there's space it's a good zone too.
- Imperial Tomb: Someone said me that is a good place to AoE too. Never tested...
- Primeval Isle: good place for mage class.

Now for the primeval time, there are 4 quests to do before the "special" one: Edit: The quest was changed and instead of 15M XP it gives only 1.5M now

At this level theres a few areas that have some quest related. I didn't test them all but as fa as i know they are not worth mentioning. IF someone tested them and think they are worth the time please reply with some details.

Now there's a few areas that you can explore:
- Crypt of Disgrace: Good place to AoE or Solo XP. For solo use the start zone, for AoE use the pyramid zone.
- Den of Evil: Another good place for AoE or Solo XP.
- Bloody Swampland: A bit hard place but some classes can use it to XP. Its an area where lvl 85+ use so be careful.
- Primeval Island: For mage class the AoE+quest is still a good place to XP.
- Dragon Valley: I don't know much about this area but it's supposed to be a good place to hunt.

First thing to do when you hit 85 is to do your awaken quest. If you click on the button that appear when you hit lvl 85 you will see a bunch of videos and some story related content. In the end you will have to go to the place where you started: Talking Island.

Next you have Kartia's Labyrinth. It's a daily instance that you can do it daily (One solo and one in group). Good XP reward.
You can find some guides here (solo) or here (group)
Don't forget to start the quest before entering the the instance for an extra reward.

That said probably a good time to hunt in the new areas:
- Harnak Underground Ruins: Good group place to hunt. (Lvl 85-88)
- Altar of Evil: Solo place. (Lvl 85-88)
- Bloody Swamp: Solo place. (Lvl 85-88)
- Seed of Annihilation: Party place. (Lvl 85-88)

and the daily quest:(Lvl 99) Retrieving the Fragment of Chaos (Leona Blackbird in Hellbound)

With Valiance a few quests were changed to give an extra SP prize. Kartia 95 (solo and group), the "Filling the Energy of Destruction" quest, the CoC quests and the 50 Oly matches. Consider doing them if you looking for SP.

With the Ertheia Update there is a new instance that you can do with a party of 4: Dimensional Warp.
There are a few quests that you can do on this isntances called "The Dimensional Warp". It's a 7 part quest and each part will give a really nice SP reward:

In futurue, You should add more details on these quest. e.g., npc names, location, how do get there...
This guide is for mid level, who know basic concept about L2, for total newbies it would be a bit hard to a cordinate.

In futurue, You should add more details on these quest. e.g., npc names, location, how do get there...
This guide is for mid level, who know basic concept about L2, for total newbies it would be a bit hard to a cordinate.

My idea is to link this quests to sites with all the details on the quests. For now i don't think there's any one out there. If you find one please post here and i will link to it.

Wow dude, great guide. One of the best that I've seen surface up over the past few weeks. I don't really need guides while leveling, but this'll be great for new players because I pretty much did most of this stuff while leveling.